Removal of cationic dyes by poly(acrylamide-co-acrylic acid) hydrogels in aqueous solutions

Swelling studies and adsorption of safranin T by acrylamide/maleic acid/methylene-bis-acrylamide based hydrogels

“…According to obtained value for n = 0.665, the mechanism of water penetration is the anomalous type, like other hydrogel-based systems studied by using F C and equation 3, i.e. swelling of AAm/Acrylic acid-based hydrogel in water at 25 ºC, with values for n between 0.70-0.76 and k between 0.0035-0.0040, depending on the acrylic acid content of the hydrogel [26]. Figure 3b shows the plot of LnF K vs. Lnt plot for data collected during swelling of poly(AAm-co-MA)-90/10-3-based hydrogel at 21ºC.…”

“…Typical adsorbents to remove ST + include activated carbon [22] and low cost waste materials such as rice husk [23,24] and activated carbon prepared from corncobs [25]. On the other hand, studies on the use of hydrogels for ST + removal is scarce [26], even when these materials have been widely studied for the removal of some ionic dyes as shown in Table 1. This paper presents results obtained from swelling and adsorption studies of the cationic dye ST + in aqueous medium, for a well characterized acrylamide (AAm)/maleic acid (MA)/methylen-bisacrylamide (MBA)-based hydrogel, with the purpose of contributing to knowledge of systems useful to the removal of this dye.…”

New copolymer of acrylamide with allyl methacrylate and its capacity for the removal of azo dyes

“…In the related literature, AA monomer was copolymerized with different functional monomers in order to obtain useful synthetic adsorbents for dye removal of water. Solpan et al have studied the radiation-induced copolymerization of acrylamide and acrylic acid to uptake of some cationic dyes such as Safranine and Magenta [4] . Poly(acrylamide-co-ethylene glycol dimethacrylate) was synthesized to remove catechins and caffeine by Lu et al [5] There are also a lot of studies about poly(acryamide) modification.…”

Preparation and characterization of poly(acryl amide-coacrylic acid)/nay and Clinoptilolite nanocomposites with improved methylene blue dye removal behavior from aqueous solution

“…Hydrogels have considerable applications and have been used extensively in different fields including chemical separation [12], drug delivery [13] and controlled release in agriculture [14]. One of the polymeric hydrogels is super absorbent that are loosely cross-linked hydrophilic polymers that can absorb, swell and retain aqueous solutions up to hundred times of their own weight [1,[15][16][17][18][19]. Because the super absorbent hydrogels have ionic functional groups, they can absorb and trap ionic dyes such as MB from wastewaters [16].…”

“…One of the polymeric hydrogels is super absorbent that are loosely cross-linked hydrophilic polymers that can absorb, swell and retain aqueous solutions up to hundred times of their own weight [1,[15][16][17][18][19]. Because the super absorbent hydrogels have ionic functional groups, they can absorb and trap ionic dyes such as MB from wastewaters [16]. But these polymers have several limitations and always exhibit mechanically weak, brittle properties and low porosity [20].…”